1/*	$OpenBSD: tcb.h,v 1.2 2011/11/08 15:39:50 kettenis Exp $	*/
2
3/*
4 * Copyright (c) 2011 Philip Guenther <guenther@openbsd.org>
5 *
6 * Permission to use, copy, modify, and distribute this software for any
7 * purpose with or without fee is hereby granted, provided that the above
8 * copyright notice and this permission notice appear in all copies.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17 */
18
19#ifndef _MACHINE_TCB_H_
20#define _MACHINE_TCB_H_
21
22#ifdef _KERNEL
23
24#define TCB_GET(p)		\
25	((void *)(p)->p_md.md_regs->tf_cr27)
26#define TCB_SET(p, addr)	\
27	((p)->p_md.md_regs->tf_cr27 = (unsigned)(addr))
28
29#else /* _KERNEL */
30
31/* ELF TLS ABI calls for small TCB, with static TLS data after it */
32#define TLS_VARIANT	1
33
34/* Get a pointer to the TCB itself */
35static inline void *
36__hppa_get_tcb(void)
37{
38	void *val;
39	__asm__ ("mfctl %%cr27, %0" : "=r" (val));
40	return val;
41}
42#define TCB_GET()		__hppa_get_tcb()
43
44#endif /* _KERNEL */
45
46#endif /* _MACHINE_TCB_H_ */
47